diff --git a/server/src/TSServer.cpp b/server/src/TSServer.cpp
index 5330e3a..28cbc18 100644
--- a/server/src/TSServer.cpp
+++ b/server/src/TSServer.cpp
@@ -860,7 +860,7 @@ vector<pair<ts::permission::PermissionType, ts::permission::v2::PermissionFlagge
 		}
 
 		if(found_negate) {
-			server_group_data.erase(find_if(server_group_data.begin(), server_group_data.end(), [](auto data) { return std::get<2>(data); }), server_group_data.end());
+			server_group_data.erase(find_if(server_group_data.begin(), server_group_data.end(), [](auto data) { return !std::get<2>(data); }), server_group_data.end());
 			logTrace(this->serverId, "[Permission] Found negate flag within server groups. Groups left: {}", server_group_data.size());
 			sassert(!server_group_data.empty()); /* this should never happen! */
 			permission::PermissionValue current_lowest = 0;